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RadioShack 22-168

RadioShack 22-168

RadioShack 22-168
Status supported
Source code serial-dmm
Counts 2000
IEC 61010-1 Unspecified
Connectivity RS232
Measurements voltage, current, resistance, capacitance, continuity, diode, logic, frequency, hFE
Features data hold, min/max, 10 reading memory
Website radioshack.com

The RadioShack 22-168 is a 2000 counts handheld digital multimeter with RS-232 connectivity.

Hardware

  • 3 1/2 digit ADC with bandgap reference: Maxim MAX130CPL (datasheet) (marking: "Maxim MAX130CPL 0138-3 C10039")
  • CPU: Metex KS57C2016 (Samsung KS57C2016 4-bit microcontroller with custom Metex firmware) (marking: "Metex 93D3 KS57C2016-02 410")
  • ?: Metex 9005 (marking has ST logo: "Metex 9005 MET7ACS 92A32792BA")
  • Crystal: 4.1856MHz crystal
  • 555 timer: Intersil ICM7555CBA (datasheet) (marking: "H 7555 CBA L405")
  • Quad analog switch/quad multiplexer: Motorola 14066B (datasheet) (marking: "14066B XAC334")
  • Quad 2-input NAND gate: GD4011BD
  • Optoisolator: Lite-ON LTV-817
  • Unidentified ICs: Two ICs, which appear to be SSOP8 packages are hidden behind black goo. The purpose of the goo is unknown.

Photos

Rs 22 168 Sandwiched Pcb Rs 22 168 Sandwiched Pcb

Rs 22 168 Ics4 Rs 22 168 Ics4

Rs 22 168 Ics1 Rs 22 168 Ics1

Rs 22 168 Optoisolation Rs 22 168 Optoisolation

Rs 22 168 Bare Dmm Rs 22 168 Bare Dmm

Rs 22 168 Pcb Second Top Rs 22 168 Pcb Second Top

Rs 22 168 Rs232 Interface Port Rs 22 168 Rs232 Interface Port

Rs 22 168 Cover Front Rs 22 168 Cover Front

Rs 22 168 Batt Cover Rs 22 168 Batt Cover

Rs 22 168 Cover Back Rs 22 168 Cover Back

Rs 22 168 Metex Stand Rs 22 168 Metex Stand

Rs 22 168 Lcd Rs 22 168 Lcd

Rs 22 168 Spare Fuse Rs 22 168 Spare Fuse

Rs 22 168 Pcb Second Bottom Rs 22 168 Pcb Second Bottom

Rs 22 168 Pcb Main Front Rs 22 168 Pcb Main Front

Rs 22 168 Ics2 Rs 22 168 Ics2

Rs 22 168 Cable Mated Rs 22 168 Cable Mated

Rs 22 168 Angle Rs 22 168 Angle

Rs 22 168 Hidden Components Rs 22 168 Hidden Components

Rs 22 168 Pcb Main Front Light Rs 22 168 Pcb Main Front Light

Rs 22 168 Inside Mooning Rs 22 168 Inside Mooning

Rs 22 168 Ics5 Rs 22 168 Ics5

Rs 22 168 Pcb 2 Bottom Light Rs 22 168 Pcb 2 Bottom Light

Rs 22 168 Pcb Main Back Light Rs 22 168 Pcb Main Back Light

Rs 22 168 Mosc Rs 22 168 Mosc

Rs 22 168 Mugshot Rs 22 168 Mugshot

Rs 22 168 Rangeswitch Rs 22 168 Rangeswitch

Rs 22 168 Batt Comp Rs 22 168 Batt Comp

Rs 22 168 Opened Mooning Rs 22 168 Opened Mooning

Rs 22 168 Pcb Top Light Rs 22 168 Pcb Top Light

Rs 22 168 Ics3 Rs 22 168 Ics3

Rs 22 168 Lcd Back Rs 22 168 Lcd Back

Rs 22 168 Back Rs 22 168 Back

Protocol

See Multimeter_ICs#Metex_14-byte_ASCII.

Resources