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1 | ------------------------------------------------------------------------------- | |
2 | README.devices | |
3 | ------------------------------------------------------------------------------- | |
4 | ||
5 | This README contains various notes for users of libsigrok (or frontends | |
6 | that are based on libsigrok) about device- and/or driver-specific issues. | |
7 | ||
8 | ||
9 | Firmware | |
10 | -------- | |
11 | ||
12 | Some devices supported by libsigrok need a firmware to be uploaded every time | |
13 | the device is connected to the PC (usually via USB), before it can be used. | |
14 | ||
15 | The default locations where libsigrok expects the firmware files are: | |
16 | ||
17 | $SIGROK_FIRMWARE_DIR (environment variable) | |
18 | $HOME/.local/share/sigrok-firmware | |
19 | $prefix/share/sigrok-firmware | |
20 | /usr/local/share/sigrok-firmware | |
21 | /usr/share/sigrok-firmware | |
22 | ||
23 | ($prefix is usually /usr/local or /usr, depending on your ./configure options) | |
24 | ||
25 | For further information see the section below and also: | |
26 | ||
27 | http://sigrok.org/wiki/Firmware | |
28 | ||
29 | ||
30 | Per-driver firmware requirements | |
31 | -------------------------------- | |
32 | ||
33 | The following drivers/devices require a firmware upload upon connection: | |
34 | ||
35 | - asix-sigma: The ASIX SIGMA and SIGMA2 require various firmware files, | |
36 | depending on the settings used. These files are available from our | |
37 | 'sigrok-firmware' repository/project under a license which allows us | |
38 | to redistribute them. | |
39 | ||
40 | - dreamsourcelab-dslogic: The DreamSourceLab DSLogic/DSCope device series | |
41 | requires various firmware files and FPGA bitstream files. | |
42 | These can be extracted/downloaded from the vendor's GitHub repo using a | |
43 | tool from our 'sigrok-util' repository/project. | |
44 | ||
45 | - fx2lafw: Logic analyzers based on the Cypress FX2(LP) chip need the | |
46 | firmware files from the 'sigrok-firmware-fx2lafw' repository/project. | |
47 | The firmware is written from scratch and licensed under the GNU GPLv2+. | |
48 | ||
49 | - hantek-6xxx: Certain oscilloscopes based on the Cypress FX2(LP) chip, such | |
50 | as the Hantek 6022BE/6022BL, SainSmart DDS120, and Rocktech BM102, need the | |
51 | firmware files from the 'sigrok-firmware-fx2lafw' repository/project. | |
52 | The firmware is written from scratch and licensed under the GNU GPLv2+. | |
53 | ||
54 | - hantek-dso: The Hantek DSO-2090 (and other supported models of the same | |
55 | series of Hantek PC oscilloscopes) need firmware files. | |
56 | These can be extracted from the vendor's Windows drivers using a tool | |
57 | from our 'sigrok-util' repository/project. | |
58 | ||
59 | - lecroy-logicstudio: The LeCroy LogicStudio requires FPGA bitstream files. | |
60 | These can be extracted from the vendor's Windows software using a tool | |
61 | from our 'sigrok-util' repository/project. | |
62 | Additionally, it requires a Cypress FX2 firmware. This can be extracted | |
63 | from the vendor's Windows software using another tool. Details: | |
64 | ||
65 | http://sigrok.org/wiki/LeCroy_LogicStudio#Firmware | |
66 | ||
67 | - saleae-logic16: The Saleae Logic16 needs a firmware file for the | |
68 | Cypress FX2 chip in the device, as well as two FPGA bitstream files. | |
69 | These can be extracted from the vendor's Linux application using a tool | |
70 | from our 'sigrok-util' repository/project. | |
71 | ||
72 | - saleae-logic-pro: The Saleae Logic Pro 16 needs a firmware file for the | |
73 | Cypress FX3 chip in the device, as well as an FPGA bitstream file. | |
74 | These can be extracted from the vendor's Linux application using a tool | |
75 | from our 'sigrok-util' repository/project. | |
76 | ||
77 | - sysclk-lwla: | |
78 | ||
79 | - The Sysclk LWLA1034 requires various bitstream files. | |
80 | These files are available from our 'sigrok-firmware' repository/project | |
81 | under a license which allows us to redistribute them. | |
82 | ||
83 | - The Sysclk LWLA1016 requires various bitstream files. | |
84 | These can be extracted from the vendor's Windows drivers using a tool | |
85 | from our 'sigrok-util' repository/project. | |
86 | ||
87 | - sysclk-sla5032: The Sysclk SLA5032 needs an FPGA bitstream file. | |
88 | This file can be copied (and renamed) from the Windows vendor software | |
89 | installation directory. Details: | |
90 | ||
91 | https://sigrok.org/wiki/Sysclk_SLA5032#Firmware | |
92 | ||
93 | The following drivers/devices do not need any firmware upload: | |
94 | ||
95 | - agilent-dmm | |
96 | - appa-55ii | |
97 | - arachnid-labs-re-load-pro | |
98 | - atten-pps3xxx | |
99 | - baylibre-acme | |
100 | - beaglelogic | |
101 | - brymen-dmm | |
102 | - cem-dt-885x | |
103 | - center-3xx (including all subdrivers) | |
104 | - chronovu-la | |
105 | - colead-slm | |
106 | - conrad-digi-35-cpu | |
107 | - demo | |
108 | - fluke-45 | |
109 | - fluke-dmm | |
110 | - ftdi-la | |
111 | - gmc-mh-1x-2x (including all subdrivers) | |
112 | - gwinstek-gds-800 | |
113 | - gwinstek-gpd | |
114 | - hameg-hmo | |
115 | - hantek-4032l | |
116 | - hp-3457a | |
117 | - hp-3478a | |
118 | - hung-chang-dso-2100 | |
119 | - ikalogic-scanalogic2 | |
120 | - ikalogic-scanaplus | |
121 | - ipdbg-la | |
122 | - kecheng-kc-330b | |
123 | - kern-scale | |
124 | - korad-kaxxxxp | |
125 | - lascar-el-usb | |
126 | - lecroy-xstream | |
127 | - link-mso19 | |
128 | - manson-hcs-3xxx | |
129 | - maynuo-m97 | |
130 | - mic-985xx (including all subdrivers) | |
131 | - microchip-pickit2 | |
132 | - mooshimeter-dmm | |
133 | - motech-lps-30x | |
134 | - norma-dmm | |
135 | - openbench-logic-sniffer | |
136 | - pce-322a | |
137 | - pipistrello-ols | |
138 | - rdtech-dps | |
139 | - rigol-ds | |
140 | - rohde-schwarz-sme-0x | |
141 | - scpi-dmm | |
142 | - scpi-pps | |
143 | - serial-dmm (including all subdrivers) | |
144 | - serial-lcr (including all subdrivers) | |
145 | - siglent-sds | |
146 | - teleinfo | |
147 | - testo | |
148 | - tondaj-sl-814 | |
149 | - uni-t-dmm (including all subdrivers) | |
150 | - uni-t-ut32x | |
151 | - yokogawa-dlm | |
152 | - zeroplus-logic-cube | |
153 | - zketech-ebd-usb | |
154 | ||
155 | ||
156 | Specifying serial ports | |
157 | ----------------------- | |
158 | ||
159 | Many devices supported by libsigrok use serial port based cables (real RS232 | |
160 | or USB-to-serial ones, CDC class) to connect to a PC. These serial cables are | |
161 | supported by the libserialport library. Some vendors prefer to use HID chips | |
162 | instead of CDC chips in their serial cables. These cables can get supported | |
163 | by means of the hidapi library. Note that each chip type requires specific | |
164 | support in the libsigrok library. Bluetooth connected devices may be supported | |
165 | as well when they communicate by means of RFCOMM channels, or one of the | |
166 | implemented BLE notification/indication approaches, and one of the Bluetooth | |
167 | supporting platforms is used. | |
168 | ||
169 | For all these devices, you need to specify the serial port they are connected | |
170 | to (e.g. using the 'conn' option in sigrok-cli). It is not possible to scan | |
171 | for such devices without specifying a serial port. | |
172 | ||
173 | Example: | |
174 | ||
175 | $ sigrok-cli --driver <somedriver>:conn=/dev/ttyUSB0 ... | |
176 | $ sigrok-cli --driver <somedriver>:conn=hid/cp2110 ... | |
177 | $ sigrok-cli --driver <somedriver>:conn=bt/rfcomm/01-23-45-67-89-ab ... | |
178 | ||
179 | Formal syntax for serial communication: | |
180 | ||
181 | - COM ports (RS232, USB CDC): | |
182 | conn=<com-port> | |
183 | - USB HID cables: | |
184 | conn=hid[/<chip>] | |
185 | conn=hid[/<chip>]/usb=<bus>.<dev>[.<if>] | |
186 | conn=hid[/<chip>]/raw=<path> | |
187 | conn=hid[/<chip>]/sn=<serno> | |
188 | chip can be: bu86x, ch9325, cp2110, victor | |
189 | path may contain slashes | |
190 | path and serno are "greedy" (span to the end of the spec) | |
191 | - Bluetooth Classic and Bluetooth Low Energy (BLE): | |
192 | conn=bt/<conn>/<addr> | |
193 | conn can be: rfcomm, ble122, nrf51, cc254x | |
194 | addr can be "dense" or separated, bt/cc254x/0123456789ab or | |
195 | bt/rfcomm/11-22-33-44-55-66 or bt/ble122/88:6b:12:34:56:78 | |
196 | (note that colons may not be available when the conn= spec is taken | |
197 | from a string that separates fields by colon, e.g. in the "--driver | |
198 | <name>:conn=<spec>" example, that is why the dense form and the use | |
199 | of dashes for separation are supported) | |
200 | ||
201 | Some of the drivers implement a default for the connection. Some of the | |
202 | drivers can auto-detect USB connected devices. | |
203 | ||
204 | Beyond strict serial communication over COM ports (discussed above), the | |
205 | conn= property can also address specific USB devices, as well as specify TCP | |
206 | or VXI communication parameters. See these examples: | |
207 | ||
208 | $ sigrok-cli --driver <somedriver>:conn=<vid>.<pid> ... | |
209 | $ sigrok-cli --driver <somedriver>:conn=tcp-raw/<ipaddr>/<port> ... | |
210 | $ sigrok-cli --driver <somedriver>:conn=vxi/<ipaddr> ... | |
211 | $ sigrok-cli --driver <somedriver>:conn=usbtmc/<bus>.<addr> ... | |
212 | ||
213 | ||
214 | Specifying serial port parameters | |
215 | --------------------------------- | |
216 | ||
217 | Every serial device's driver has default serial port parameters like baud | |
218 | rate, number of data bits, stop bits and handshake status. If a device requires | |
219 | different parameters, pass them as option "serialcomm" with the driver name. | |
220 | See libsigrok docs for the function serial_set_paramstr() for complete specs. | |
221 | ||
222 | Example: | |
223 | ||
224 | $ sigrok-cli --driver <somedriver>:conn=<someconn>:serialcomm=9600/7n1/dtr=1 | |
225 | ||
226 | ||
227 | Permissions of serial port based devices | |
228 | ---------------------------------------- | |
229 | ||
230 | When using devices supported by libsigrok that use serial port based cables | |
231 | (real RS232 or USB-to-serial ones) to connect to a PC, you need to ensure | |
232 | that the user running the libsigrok frontend has (read/write) permissions to | |
233 | access the serial port device (e.g. /dev/ttyS0, /dev/ttyUSB0, and so on). | |
234 | ||
235 | You can use 'chmod' to apply permissions as you see fit, and/or 'chown' to | |
236 | change the owner of the serial port device to a certain user or group. | |
237 | ||
238 | For USB-to-serial based devices, we recommended using our udev rules file | |
239 | (see below for details). | |
240 | ||
241 | ||
242 | Permissions for USB devices (udev rules files) | |
243 | ---------------------------------------------- | |
244 | ||
245 | When using USB-based devices supported by libsigrok, the user running the | |
246 | libsigrok frontend (e.g. sigrok-cli) has to have (read/write) permissions | |
247 | for the respective USB device. | |
248 | ||
249 | On Linux, this is accomplished using udev rules. libsigrok ships a rules | |
250 | file containing all supported devices which can be detected reliably | |
251 | (generic USB-to-serial converters are omitted, as these are used for a wide | |
252 | range of devices, e.g. GPS receivers, which are not handled by libsigrok). | |
253 | ||
254 | The file is available in contrib/60-libsigrok.rules. This file just contains | |
255 | the list of devices and flags these devices with ID_SIGROK="1". Access is | |
256 | granted by the 61-libsigrok-plugdev.rules or 61-libsigrok-uaccess.rules files, | |
257 | allowing access to members of the plugdev group or to currently logged in | |
258 | users, respectively. | |
259 | ||
260 | When using a libsigrok package from your favorite Linux distribution, the | |
261 | files should already be installed in /usr/lib/udev/rules.d/, i.e. | |
262 | 60-libsigrok.rules and one of the access granting rules files. Use of | |
263 | 61-libsigrok-uaccess.rules is encouraged on systemd distributions. | |
264 | ||
265 | The access policy can be locally overridden by placing appropriate rules in | |
266 | /etc/udev/rules.d/, disabling or ammending the default policy. See the | |
267 | udev documentation, e.g. man 7 udev, for details. | |
268 | ||
269 | If you're building from source, you need to copy the file to the place | |
270 | where udev will read these rules. Local rules should go to /etc/udev/rules.d. | |
271 | Keep the file naming, otherwise interaction between the libsigrok rules and | |
272 | rules shipped by the system will be broken. | |
273 | ||
274 | Please consult the udev docs for details. | |
275 | ||
276 | ||
277 | Cypress FX2 based devices | |
278 | ------------------------- | |
279 | ||
280 | Devices using the Cypress FX2(LP) chip without any specific USB VID/PID will | |
281 | be enumerated with VID/PID 04b4:8613 (the default for "unconfigured FX2"). | |
282 | These are usually "FX2 eval boards" (that can also be used as LAs, though). | |
283 | ||
284 | On Linux, the 'usbtest' driver will usually grab such devices, and they will | |
285 | thus not be usable by libsigrok (and frontends). | |
286 | ||
287 | You can fix this by running 'rmmod usbtest' as root before using the device. | |
288 | ||
289 | ||
290 | UNI-T DMM (and rebranded models) cables | |
291 | --------------------------------------- | |
292 | ||
293 | UNI-T multimeters (and rebranded devices, e.g. some Voltcraft models) can | |
294 | ship with different PC connectivity cables: | |
295 | ||
296 | - UT-D02 (RS232 cable) | |
297 | - UT-D04 (USB/HID cable with Hoitek HE2325U chip, USB VID/PID 04fa:2490) | |
298 | - UT-D04 (USB/HID cable with WCH CH9325 chip, USB VID/PID 1a86:e008) | |
299 | - UT-D07 (Bluetooth adapter, ISSC BL79 BLETR chip) | |
300 | - UT-D09 (USB/HID cable with SiL CP2110 chip, USB VID/PID 10c4:ea80) | |
301 | ||
302 | The above cables are all physically compatible (same IR connector shape) | |
303 | with all/most currently known UNI-T multimeters. For example, you can | |
304 | use either of the UT-D04 USB/HID cables or the UT-D02 RS232 cable with | |
305 | the UNI-T UT61D multimeter. | |
306 | ||
307 | When using the UT-D02 RS232 cable with any of the supported UNI-T DMMs, | |
308 | you have to use the respective driver with a '-ser' drivername suffix | |
309 | (internally all of these models are handled by the 'serial-dmm' driver). | |
310 | ||
311 | You also need to specify the serial port via the 'conn' option, e.g. | |
312 | /dev/ttyUSB0 (attached via a USB-to-serial cable) or /dev/ttyS0 (actual | |
313 | RS232 port) on Linux (see above). | |
314 | ||
315 | Finally, the user running the frontend (e.g. sigrok-cli) also needs | |
316 | permissions to access the respective serial port (see above). | |
317 | ||
318 | Examples (sigrok-cli): | |
319 | ||
320 | $ sigrok-cli --driver uni-t-ut61e-ser:conn=/dev/ttyUSB0 ... | |
321 | $ sigrok-cli --driver voltcraft-vc820-ser:conn=/dev/ttyS0 ... | |
322 | ||
323 | When using any of the UT-D04 USB/HID cables you have to use the respective | |
324 | driver _without_ the '-ser' drivername suffix (internally all of these models | |
325 | are handled by the 'uni-t-dmm' driver). | |
326 | ||
327 | You also need to specify the USB vendor/device IDs of the cable. | |
328 | Autodetection is not possible here, since various other products use the | |
329 | USB VID/PID of those cables too, and there is no way to distinguish them. | |
330 | ||
331 | Since the UT-D04 cables are USB based (but don't use a USB-to-serial chip) | |
332 | there is no need to specify a serial port via 'conn', of course. | |
333 | However, the user running the frontend does also need to have permissions | |
334 | to access the respective USB device (see above). | |
335 | ||
336 | Examples (sigrok-cli): | |
337 | ||
338 | $ sigrok-cli --driver uni-t-ut61e:conn=1a86.e008 ... | |
339 | $ sigrok-cli --driver voltcraft-vc820:conn=04fa.2490 ... | |
340 | ||
341 | ||
342 | UNI-T UT-D04 cable issue on Linux | |
343 | --------------------------------- | |
344 | ||
345 | The UNI-T UT-D04 cable with Hoitek HE2325U (or WCH CH9325) chip seems to have | |
346 | a very specific problem on Linux. Apparently it requires to be put into | |
347 | suspend (and woken up again) before it is usable. This seems to be a | |
348 | Linux-only issue, Windows is not affected by this since apparently the | |
349 | Windows kernel does this for every USB device, always. | |
350 | ||
351 | Thus, if you want to use any of the UNI-T DMMs with this specific cable, | |
352 | you'll have to run the following script (as root) once, every time you attach | |
353 | the cable via USB. The script was written by Ralf Burger. | |
354 | ||
355 | See also: http://erste.de/UT61/index.html | |
356 | ||
357 | #!/bin/bash | |
358 | for dat in /sys/bus/usb/devices/*; do | |
359 | if test -e $dat/manufacturer; then | |
360 | grep "WCH.CN" $dat/manufacturer > /dev/null && echo auto > ${dat}/power/level && echo 0 > ${dat}/power/autosuspend | |
361 | fi | |
362 | done | |
363 | ||
364 | ||
365 | Enabling multimeter / data logger measurement output | |
366 | ---------------------------------------------------- | |
367 | ||
368 | Some multimeters or data loggers will not start outputting measurement data | |
369 | unless a certain action has been performed by the user beforehand. This is | |
370 | usually mentioned in the vendor manual of the respective device, but here's | |
371 | a short list for convenience: | |
372 | ||
373 | - BBC Goertz Metrawatt M2110: Briefly press the "Start/Reset" button on the | |
374 | interface panel on top. | |
375 | - Brymen BM257s: Press HOLD during power-on. | |
376 | - Digitek DT4000ZC: Briefly press the "RS232" button. | |
377 | - EEVBlog 121GW: Hold "1ms PEAK" until the "BT" indicator is shown. | |
378 | - ES51919 based LCR meters (DER EE DE-5000, PeakTech 2170, UNI-T UT612): | |
379 | Press the button with the "RS232" or "USB" or "PC link" label (usually | |
380 | the "up" cursor button). | |
381 | - Gossen Metrawatt Metrahit 1x/2x devices, driver gmc-mh-1x-2x-rs232: | |
382 | - Power on the device with the "DATA" button pressed. | |
383 | - Metrahit 2x devices must be configured for the respective interface type. | |
384 | - Gossen Metrawatt Metrahit 2x devices, driver gmc-mh-2x-bd232: | |
385 | - 'BD232' interface: | |
386 | The multimeter must be configured for the respective interface type. | |
387 | - 'SI232-II' interface ("PC Mode"): | |
388 | The multimeter must be configured for interface type 'BD232' (all), | |
389 | 'SI232 online' (28-29S) or 'SI232 store' (22-26x). The interface must | |
390 | be configured to the same baud rate as the host (default 9600). | |
391 | Multimeter and interface must be configured to the same address. | |
392 | - MASTECH MS6514: Press the "Setup/PC-Link" button for roughly 3 seconds. | |
393 | - Metrix MX56C: Press the PRINT button to have the meter send acquisition | |
394 | data via IR. Hold the PRINT button to adjust the meter's transmission | |
395 | interval. | |
396 | - Norma DM950: If the interface doesn't work (e.g. USB-RS232 converter), power | |
397 | on the device with "FUNC" pressed (to power the interface from the DMM). | |
398 | - PCE PCE-DM32: Briefly press the "RS232" button. | |
399 | - RadioShack 22-812: Press and hold "SELECT" and "RANGE" together. | |
400 | - TekPower TP4000ZC: Briefly press the "RS232" button. | |
401 | - Tenma 72-7750: Briefly press the "RS232C" button. | |
402 | - UNI-T UT60G: Briefly press the "RS232C" button. | |
403 | - UNI-T UT61B/C/D: Press the "REL/RS232/USB" button for roughly 1 second. | |
404 | - UNI-T UT71x: Press the "SEND/-/MAXMIN" button for roughly 1 second. | |
405 | Briefly pressing the "EXIT" button leaves this mode again. | |
406 | - UNI-T UT325: Briefly press the "SEND" button (as per manual). However, it | |
407 | appears that in practice you don't have to press the button (at least on | |
408 | some versions of the device), simply connect the device via USB. | |
409 | - V&A VA18B/VA40B: Keep the "Hz/DUTY" key pressed while powering on the DMM. | |
410 | - Victor 70C/86C: Press the "REL/RS232" button for roughly 1 second. | |
411 | - Voltcraft VC-830: Press the "REL/PC" button for roughly 2 seconds. | |
412 | - Voltcraft VC-870: Press the "REL/PC" button for roughly 1 second. | |
413 | ||
414 | ||
415 | ChronoVu LA8/LA16 USB VID/PIDs | |
416 | ------------------------------ | |
417 | ||
418 | The ChronoVu LA8/LA16 logic analyzer is available in two revisions. Previously, | |
419 | the device shipped with a USB VID/PID of 0403:6001, which is the standard ID | |
420 | for FTDI FT232 USB chips. | |
421 | ||
422 | Since this made it hard to distinguish the LA8/LA16 from any other device | |
423 | with this FTDI chip connected to the PC, the vendor later shipped the | |
424 | device with a USB VID/PID of 0403:8867. | |
425 | ||
426 | The 'chronovu-la' driver in libsigrok supports both VID/PID pairs and | |
427 | automatically finds devices with either VID/PID pair. | |
428 | ||
429 | ||
430 | OLS | |
431 | --- | |
432 | ||
433 | The Dangerous Prototypes Openbench Logic Sniffer (OLS) logic analyzer | |
434 | driver in libsigrok assumes a somewhat recent firmware has been flashed onto | |
435 | the OLS (it doesn't need a firmware upload every time it's attached via USB, | |
436 | since the firmware is stored in the device permanently). | |
437 | ||
438 | The most recent firmware version that is tested is 3.07. | |
439 | ||
440 | If you use any older firmware and your OLS is not found or is not working | |
441 | properly, please upgrade to at least this firmware version. Check the | |
442 | Dangerous Prototypes wiki for firmware upgrade instructions: | |
443 | ||
444 | http://dangerousprototypes.com/docs/Logic_Sniffer_upgrade_procedure | |
445 | ||
446 | Also, you need to specify a serial port for the OLS in the frontends, e.g. | |
447 | using the 'conn' option in sigrok-cli, and you also need to have the | |
448 | permissions to access the serial port (see above). | |
449 | ||
450 | Example: | |
451 | ||
452 | $ sigrok-cli --driver ols:conn=/dev/ttyACM0 ... | |
453 | ||
454 | ||
455 | Mooshimeter | |
456 | ----------- | |
457 | ||
458 | The Mooshim Engineering Mooshimeter is controlled via Bluetooth Low Energy | |
459 | (sometimes called Bluetooth 4.0), as such it requires a supported Bluetooth | |
460 | interface available. The 'conn' option is required and must contain the | |
461 | Bluetooth MAC address of the meter. | |
462 | ||
463 | Example: | |
464 | ||
465 | $ sigrok-cli --driver mooshimeter-dmm:conn=12-34-56-78-9A-BC ... | |
466 | ||
467 | Since the Mooshimeter has no physical interface on the meter itself, the | |
468 | channel configuration is set with the 'channel_config' option. The format | |
469 | of this option is 'CH1,CH2' where each channel configuration has the form | |
470 | 'MODE:RANGE:ANALYSIS', with later parts being optional. In addition for | |
471 | CLI compatibility, the ',' in the channels can also be a '/' and the ':' in | |
472 | the individual configuration can be a ';'. | |
473 | ||
474 | Available channel 1 modes: | |
475 | ||
476 | - Current, A: Current in amps | |
477 | - Temperature, T, K: Internal meter temperature in Kelvin | |
478 | - Resistance, Ohm, W: Resistance in ohms | |
479 | - Diode, D: Diode voltage | |
480 | - Aux, LV: Auxiliary (W input) low voltage sensor (1.2V max) | |
481 | ||
482 | Available channel 2 modes: | |
483 | ||
484 | - Voltage, V: Voltage | |
485 | - Temperature, T, K: Internal meter temperature in Kelvin | |
486 | - Resistance, Ohm, W: Resistance in ohms | |
487 | - Diode, D: Diode voltage | |
488 | - Aux, LV: Auxiliary (W input) low voltage sensor (1.2V max) | |
489 | ||
490 | Only one channel can use the shared inputs at a time (e.g. if CH1 is measuring | |
491 | resistance, CH2 cannot measure low voltage). Temperature is excepted from | |
492 | this, so the meter can measure internal temperature and low voltage at the | |
493 | same time. | |
494 | ||
495 | Additionally, the meter can calculate the real power of both channels. This | |
496 | generally only makes sense when CH1 is set to current and CH2 is set to a | |
497 | voltage and so it is disabled by default. It must be enabled by enabling the | |
498 | 'P' channel (the third channel). | |
499 | ||
500 | The range of the channel specification sets the maximum input for that channel | |
501 | and is rounded up to the next value the meter itself supports. For example, | |
502 | specifying 50 for the voltage will result in the actual maximum of 60. | |
503 | Specifying 61 would result in 600. If omitted, sigrok will perform | |
504 | auto-ranging of the channel by selecting the next greater value than the | |
505 | latest maximum. | |
506 | ||
507 | The analysis option sets how the meter reports its internal sampling buffer | |
508 | to sigrok: | |
509 | ||
510 | - Mean, DC: The default is a simple arithmetic mean of the sample buffer | |
511 | - RMS, AC: The root mean square of the sample buffer | |
512 | - Buf, Buffer, Samples: Report the entire sample buffer to sigrok. This | |
513 | results in packets that contain all the samples in the buffer instead | |
514 | of a single output value. | |
515 | ||
516 | The size of the sample buffer is set with the 'avg_samples' option, while | |
517 | the sampling rate is set with the 'samplerate' option. So the update rate | |
518 | is avg_samples/samplerate. Both are rounded up to the next supported value | |
519 | by the meter. | |
520 | ||
521 | Example: | |
522 | ||
523 | $ sigrok-cli -c channel_config="Aux;0.1/T" --driver mooshimeter-dmm... | |
524 | $ sigrok-cli -c channel_config="A;;AC/V;;AC" --driver mooshimeter-dmm... |