V&A VA40B
 | |
| Status | |
|---|---|
| Counts | 6000 |
| IEC 61010-1 | CAT III (1000V) / CAT IV (600V) |
| Connectivity | USB |
| Measurements | voltage, current, resistance, capacitance, frequency, temperature, duty cycle, diode, continuity |
| Features | autorange, data hold, relative, min/max, backlight |
The VA40B is a 6000 count CAT III (1000V) / CAT IV (600V) handheld digital multimeter with USB connectivity.
Hardware
Multimeter:
- TODO
USB cable:
- Prolific USB-to-Serial Comm Port
- TODO
Photos
Package, contents
Bag
Bag, open
Device, front
Device, back
Device, top
Device, front without bumper
Device, back without bumper
Device, display at power on
Probes
Thermocouple K type
USB cable
USB cable, optical connector
Protocol
14-byte LCD segments over USB-2-serial (Prolific chip, 2400 baud, 8n1).
The DMM IC used in this multimeter is probably a Fortune Semiconductor FS9721_LP3 or alike, see Multimeter_ICs#Fortune_Semiconductor_FS9721_LP3 for the protocol.
The manufacturer specific last byte of the 1 byte packet (numbered 0xe) is as follows:
| Byte | Bits 7-4 | Bit 3 | Bit 2 | Bit 1 | Bit 0 |
|---|---|---|---|---|---|
| 13 | 0xe | MIN | (unused?) | °C | MAX |
To enable output to the PC on the multimeter you have to keep the Hz/DUTY key pressed while powering on the device. However, it will auto-poweroff (after roughly 1 hour?), even in this mode. To avoid that, press both the Hz/DUTY and the SELECT key during power-up (see manual page 19).