PeakTech 4390A
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 | |
| Status | supported |
|---|---|
| Source code | serial-dmm |
| Counts | 4000 |
| IEC 61010-1 | — |
| Connectivity | RS232 |
| Measurements | voltage, current, frequency, hFE, logic, continuity, diode, resistance, temperature, capacitance, power |
| Features | true-rms, signal-out, 3 sub-displays, backlight, bargraph, auto hold, data hold, range hold, min/max, relative offset, comparision, 10 reading memory |
The PeakTech 4390A is a 4000 counts handheld digital multimeter with RS232 connectivity.
This is a rebadged Metex M-3860M multimeter.
Note: This is not the same device as the PeakTech 4390, despite the very similar name.
Hardware
Main ICs:
- Multimeter IC: Metex 00M38M03 (markings: METEX / 00M38M03 / 663 / 0411KK002)
- A/D Converter: Maxim MAX134 3 3/4 Digit DMM Circuit (datasheet)
- True RMS Converter: Analog Devices AD737 (datasheet)
- Power Metering IC: Sames SA9102CSA (datasheet)
- Voltage Reference 1.2V: ICL8069 (datasheet) (markings: CC / 8069 / G301AC)
Miscellaneous ICs:
- Serial EEPROM: Atmel AT93C46 (datasheet) (markings: ATMEL 348 / 93C46)
- Optocoupler for RS232: 2x Lite-On 817B (datasheet) (markings: L0419 / 817B / Y)
- OpAmp: 2x 2904 (datasheet) (markings: 2904 / 4169B / JRC)
- Precision OpAmp: OP-07 (markings: OP-07 / 4051B / JRC)
- OpAmp: NJM062/TL062 (datasheet) (markings: 062 / 3138B / JRC)
- Quad 2-Input NAND Gate: ON Semi 74HC00A (datasheet) (markings: HC00A / ON PBK340)
- Quad Multiplexer: ON Semi 14066B (datasheet) (markings: 14066B / ON PPM426)
- 555 Timer: Intersil ICM7555 (datasheet) (markings: i 7555 / IBA / L044FCL)
- Quad 2-Input NAND Schmitt Trigger: 74HC132D (datasheet)
- Dual Decade Ripple Counter: 74HC390D (datasheet)
Fuses:
- 250V, 15A (N65)
- 250V, 800mA
Photos
Multimeter:
Device, top
Device, bottom
Big PCB, shielding
Big PCB, bottom
PCB sandwich, top
PCB sandwich, top
Big PCB, top
Big PCB, top detail
Small PCB, bottom
Small PCB, top
Power adapter
RS232 cable:
Serial cable
See Device_cables#Metex_5-pin_RS232_cable (Version 2).
Protocol
See Multimeter_ICs#Metex_14-byte_ASCII.
The device sends 4 * 14 bytes. The first 14 bytes represents the main display and then the three sub displays from left to right (left, middle, right).