Difference between revisions of "MASTECH MAS345"

From sigrok
Jump to navigation Jump to search
m (Circuit Specialists CSI345)
(More info and datasheets.)
Line 1: Line 1:
[[File:Mastech mas345 device front.jpg|thumb|right|MASTECH MAS345]]
[[File:Mastech mas345 device front.jpg|thumb|right|MASTECH MAS345]]


The [http://web.archive.org/web/20080305031323/http://www.p-mastech.com/products/04_dm/mas345.html MASTECH MAS345] is a 3999 counts, CAT II handheld digital multimeter with RS232 connectivity.
The [http://web.archive.org/web/20080305031323/http://www.p-mastech.com/products/04_dm/mas345.html MASTECH MAS345] is a 4000 counts, CAT II handheld digital multimeter with RS232 connectivity.


It is also sold under the names [http://web.archive.org/web/20070224223043/http://www.globalspecialties.com/pro70.html Global Specialties Pro-70], [http://www.circuitspecialists.com/csi345.html Circuit Specialists CSI345], [http://www.velleman.eu/products/view/?country=ot&lang=de&id=341708 Velleman DVM345DI], [http://www.xlsmess.de/html/mcvoice_-_m-345pro.html McVoice M-345pro], and [http://www.sinometer.com/jpg/MAS345.jpg Sinometer MAS345].
It is also sold under the names [http://www.circuitspecialists.com/csi345.html Circuit Specialists CSI345]<sup>1</sup>, [http://web.archive.org/web/20070224223043/http://www.globalspecialties.com/pro70.html Global Specialties Pro-70], [http://www.xlsmess.de/html/mcvoice_-_m-345pro.html McVoice M-345pro], [http://www.sinometer.com/jpg/MAS345.jpg Sinometer MAS345]. and [http://www.velleman.eu/products/view/?country=ot&lang=de&id=341708 Velleman DVM345DI].


See [[MASTECH MAS345/Info]] for more details about the device.
<small>
<sup>1</sup> The [http://www.circuitspecialists.com/products/csi345.zip software shipped by Circuit Specialists] is MasView 1.1.
</small>


== Hardware ==
== Hardware ==
Line 12: Line 14:


* '''Main chip''': MASTECH Japan M343-01 F0951D174 (80 pins, 16 + 16 + 24 + 24)
* '''Main chip''': MASTECH Japan M343-01 F0951D174 (80 pins, 16 + 16 + 24 + 24)
* '''14-stage binary counter/oscillator''': [http://datasheet.octopart.com/M74HC4060B1R-STMicroelectronics-datasheet-10836214.pdf ST 74HC4060 N00U732]
* '''14-stage binary counter/oscillator''': [http://www.st.com/internet/analog/product/69763.jsp ST 74HC4060] ([http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00000318.pdf datasheet]) (marking: "ST 74HC4060 N00U732")
* '''Precision Operational Amplifiers''': [http://www.ti.com/lit/ds/symlink/op07c.pdf Texas Instruments 12AL9JM 0P07CP]
* '''Precision perational amplifier''': [http://www.ti.com/product/op07c Texas Instruments OP07C] ([http://www.ti.com/lit/gpn/op07c datasheet]) (marking: "12AL9JM 0P07CP")
* '''?''': GC7555AP AA7057HS
* '''CMOS multifunctional time base circuit''': [http://translate.google.com/translate?sl=zh-CN&tl=en&js=n&prev=_t&hl=de&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fproduct.ch.gongchang.com%2Fd16189061.html&act=url Green Sea Technology GC7555AP] ([http://www.chinaeds.com/zl/201041695739344804_GC7555AD,GC7555APpdf.pdf datasheet], [https://translate.googleusercontent.com/translate_c?act=url&hl=de&ie=UTF8&prev=_t&rurl=translate.google.com&sl=zh-CN&tl=en&u=http://www.chinaeds.com/d.aspx%3Fid%3D298797&usg=ALkJrhh8MzVMH7GdvsM85Mvt0pR1rHF_-w English translation]) (marking: "GC7555AP AA7057HS")
* '''Opto Coupler''': [http://www.sharpsma.com/webfm_send/1092 Sharp B B5 PC817]
** This is an NE555 compatible chip, apparently.
* '''Opto Coupler''': [http://www.sharpsma.com/webfm_send/1092 Sharp B B6 PC817]
* '''General-purpose photocoupler''': [http://www.sharpsma.com/optoelectronics/isolation-devices/dc-input-photocouplers/PC817X2J000F Sharp PC817] ([http://www.sharpsma.com/webfm_send/1092 datasheet]) (marking: "B > B5 PC817 Sharp")
** "B": model = PC817X2J000F/PC817XF2J00F, ">": China factory, "B5": date code == May 1991
* '''General-purpose photocoupler''': [http://www.sharpsma.com/optoelectronics/isolation-devices/dc-input-photocouplers/PC817X2J000F Sharp PC817] ([http://www.sharpsma.com/webfm_send/1092 datasheet])  (marking: "B > B6 PC817 Sharp")
** "B": model = PC817X2J000F/PC817XF2J00F, ">": China factory, "B6": date code == June 1991
* '''Crystal''': ca. 32kHz
* '''Crystal''': ca. 32kHz
* '''Fuse''': 15A/250V (6x30mm) (for the 10A jack; interestingly the PCB silkscreen says "20A" for that jack)
* '''Fuse''': 15A/250V (6x30mm) (for the 10A jack; interestingly the PCB silkscreen says "20A" for that jack)
Line 22: Line 27:
'''RS232 cable''':
'''RS232 cable''':


* TODO.
* See [[Multimeter_cables#MASTECH_MAS34X_cable]].


== Photos ==
== Photos ==

Revision as of 16:18, 22 July 2012

MASTECH MAS345

The MASTECH MAS345 is a 4000 counts, CAT II handheld digital multimeter with RS232 connectivity.

It is also sold under the names Circuit Specialists CSI3451, Global Specialties Pro-70, McVoice M-345pro, Sinometer MAS345. and Velleman DVM345DI.

1 The software shipped by Circuit Specialists is MasView 1.1.

Hardware

Multimeter:

  • Main chip: MASTECH Japan M343-01 F0951D174 (80 pins, 16 + 16 + 24 + 24)
  • 14-stage binary counter/oscillator: ST 74HC4060 (datasheet) (marking: "ST 74HC4060 N00U732")
  • Precision perational amplifier: Texas Instruments OP07C (datasheet) (marking: "12AL9JM 0P07CP")
  • CMOS multifunctional time base circuit: Green Sea Technology GC7555AP (datasheet, English translation) (marking: "GC7555AP AA7057HS")
    • This is an NE555 compatible chip, apparently.
  • General-purpose photocoupler: Sharp PC817 (datasheet) (marking: "B > B5 PC817 Sharp")
    • "B": model = PC817X2J000F/PC817XF2J00F, ">": China factory, "B5": date code == May 1991
  • General-purpose photocoupler: Sharp PC817 (datasheet) (marking: "B > B6 PC817 Sharp")
    • "B": model = PC817X2J000F/PC817XF2J00F, ">": China factory, "B6": date code == June 1991
  • Crystal: ca. 32kHz
  • Fuse: 15A/250V (6x30mm) (for the 10A jack; interestingly the PCB silkscreen says "20A" for that jack)

RS232 cable:

Photos

Multimeter:

RS232 cable:

See Multimeter_cables#MASTECH_MAS34X_cable.

Protocol

The protocol is (partially) documented in the vendor software's "Help" window (seems to apply to MAS343, MAS344, and MAS345; the M9803R protocol is different).

  • Serial port settings: 600 baud, 7n2, RTS low, DTR high
  • Every time the host sends a (any?) character to the DMM (the vendor software sends D/0x44), it returns 14 ASCII bytes containing the measurement value and so on. The documentation states that a request interval of >= 1 second is "required for stable measuring data from meter".

Packet format:

Byte(s) Description
1-2 Measuring mode (DC, AC, OH, CA, TE, DI, ...)
3 Always a space (?)
4 Sign ('-' or ' ', i.e. a minus or a space)
5-9 Decimal point and current measurement value (Examples: 10.00, 0L, 3.999)
10-13 Unit (Examples: V, mV, A, mA, kOhm, MOhm, nF, ...)
14 Carriage return (13/0x0d)

Example packets:

01 02 03 04 05 06 07 08 09 10 11 12 13 14
D C - 0 0 0 . 0 V \r
A C 0 0 . 0 0 A \r
C A 0 . 0 7 1 n F \r
O H O . L M O h m \r

Resources