Keithley 181

The Keithley 181 is a digital multimeter marketed as a nanovoltmeter because it has 10 nV display resolution in the 2 mV (FS) range.

Keithley 181

5½-digit nanovoltmeter

Produced from (?) to (?)

Manuals

Keithley 181 Operators Manual 30918B, 1980
Keithley 181 Service Manual 30816B, 1981
Keithley 181 Operators Manual 32421A, 1982 (with schematics)

ROM Images

File	Pos.	Checksum
PRO-106 B9		00068BBF

(All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

Key Specifications

Voltage	2 mV to 200 mV FS in decade ranges on "mV" input, 2 V to 1000 V FS in decade ranges on "V" input
Input	>1 GΩ, max. 120 V on "mV" input, 10 MΩ, max. 1000 V on "V" input
Resolution	5½ digits (10 nV to 10 mV LSD
Noise	<30 nV_p-p on lowest range with filter on
Features	GPIB standard

please expand

Links

Keithley 181 Repair by Defpom's Electronics Repair @ YouTube

Pictures

Components

Some Parts Used in the Keithley 181

Part	Part Number(s)	Class	Description	Used in
2732		Monolithic integrated circuit	4K×8 EPROM	2445A • 2455A • 2465A • 2467 • DM5010 • Keithley 181 • Keithley 192 • Keithley 220 • Keithley 224 • TransEra 741-RTC
LM399	156-0783-00	Monolithic integrated circuit	heated zener reference	DM5120 • DM5520 • Keithley 181 • Keithley 182 • Keithley 191 • Keithley 192 • Keithley 193A • Keithley 196 • 1410 • 1411 • 1412
MC68488	156-1246-00	Monolithic integrated circuit	GPIB controller	7250 • 7854 • CG551AP • CG5001 • CG5010 • CG5011 • Keithley 181 • Keithley 192
MOS Technology 6522	156-1539-00	Monolithic integrated circuit	"Versatile Interface Adapter (VIA)"	FG5010 • MI5010 • SI5010 • Keithley 181 • Keithley 181A • Keithley 192 • Keithley 193A • Keithley 195 • Keithley 195A • Keithley 196 • Keithley 199 • Keithley 220 • Keithley 224 • Keithley 230
Motorola 6800	156-0426-00 • 156-2413-00 • 156-5472-01	Monolithic integrated circuit	8-bit microprocessor	021-0206-00 • 021-0374-00 • 067-0902-00 • 067-1137-99 • 222 • 222A • 222PS • 2424L • 2445 • 2465 • 2467 • 4051 • 7250 • 7912 • 7912AD • 7A16P • 7A29P • 7B81P • 7B90P • 833 • 834 • 835 • 836 • CG5001 • CG551AP • CG5010 • CG5011 • DF1 • DF2 • DM5010 • FG5010 • MI5010 • SI5010 • PS5004 • PS5010 • SG5010 • Keithley 181 • Keithley 182 • Keithley 175 • Keithley 175A • Keithley 191 • Keithley 192 • Keithley 195 • Keithley 195A • Keithley 197 • Keithley 220 • Keithley 224 • Keithley 230 • Keithley 263 • Keithley 485 • Keithley 580 • Keithley 617
Motorola 6810	156-0716-00	Monolithic integrated circuit	128×8 static RAM	021-0206-00 • DF1 • DF2 • Keithley 181