|IEC 61010-1||CAT III (1000V) / CAT IV (600V)|
|Connectivity||RS232 / USB|
|Measurements||voltage, resistance, diode, continuity, capacitance, frequency, duty cycle, current, temperature|
|Features||autorange, hold, relative, test-lead-detection (TLD), backlight|
The Voltcraft VC-850 is a 6000 counts, CAT III (1000V) / CAT IV (600V) handheld digital multimeter with RS232 or USB connectivity.
- Fortune Semiconductor FS9922-DMM4
This DMM is wired up a bit differently than "normal" for the diode mode, see below. The MEA5 to MEA1 bits are inputs of the FS9922-DMM4 chip, controlled by the position of the mode selection wheel on the DMM.
|Mode (selection wheel)||MEA5||MEA4||MEA3||MEA2||MEA1||Mode (FS9922-DMM4 datasheet)|
|Voltage DC / AC||1||0||0||0||1||DC / AC V (600.0mV ~ 6000V)|
|Resistance / continuity||0||1||1||0||0||Ohm / beeper|
|Temperature (C / F)||1||1||1||1||1||C / F|
|Frequency / duty cycle||1||0||1||0||0||Hz / Duty|
|DC / AC current (µA)||1||1||0||1||1||DC / AC µA (600.0µA / 6000µA)|
|DC / AC current (mA)||1||1||1||0||1||DC / AC mA (60.00mA / 600.0mA)|
|DC / AC current (10A)||1||1||1||1||0||DC / AC A (6.000A / 60.00A)|
When the mode selection wheel is turned to "diode" setting, the FS9922-DMM4 chip will not be put into one of its known "diode" modes ("Diode/Beeper", "Ohm/Diode/Beeper/cap.", or "Ohm/Beeper/Diode") but instead it will use the "ADP (6.000)" setting. This will light up COM4/SEG22 on the LCD (which is a "diode" symbol on this DMM) and in the PC protocol the "z1" user-defined bit will be set (but not the "voltage" and/or "diode" bits, as one would expect). Thus, some special handling is needed in order to properly parse the diode mode setting.
See the Fortune Semiconductor FS9922-DMM4 datasheet page 11 ("Measuring Modes Select") and 12 ("ADP Input/User-Defined Symbols and Confirmation of Decimal Locations") for details.