Keithley 2000 User Manual

Testing diodes
With a Model 2000, you can measure the forward voltage drop of general-purpose diodes and
the zener voltage of zener diodes. To test diodes, press SHIFT then , set the test current
range, connect the diode, and take a reading from the display.
NOTE Diode test has a non-selectable reading rate of MEDium (1 PLC).
Connections
Connect the diode leads to the INPUT HI and INPUT LO terminals on the Model 2000. The
test current flows from the INPUT HI terminal as shown in Figure 2-10.
Range
You can set the test current range from the front panel. The choices are 1mA, 100µA, and
10µA. The factory test current setting is 1mA. To set the test current, do following:
1. Press SHIFT then .
2. Use the ▲ and ▼ keys to scroll through the three test current selections.
The diode test measures voltages on the 3V range for the 1mA test current and the 10V range
for the 100µA and 10µA ranges. If a reading is more than 10V, the Model 2000 displays the
“OVERFLOW” status message.
2001 MULTIMETER
Model 2000
General-purpose
diode
SHIFT
CH1REM
TALK
LSTN
SRQ
STATREL FILT
4W
BUFFER
MATH
REAR
SCAN
TIMER
STEP CH2 CH3 CH4 CH5 CH6 CH7 CH
8
CH9 CH1
0
HOLD TRIG FAST MED SLOW AUTO ERR
2001 MULTIMETER
Model 2000
Zener
diode
SHIFT
CH1REM
TALK
LSTN
SRQ
STATREL FILT
4W
BUFFER
MATH
REAR
SCAN
TIMER
STEP CH2 CH3 CH4 CH5 CH6 CH7 CH
8
CH9 CH1
0
HOLD TRIG FAST MED SLOW AUTO ERR
Note: Source current flows from the
INPUT HI to INPUT LO terminals.
Basic Measurements 2-35
Figure 2-10
Diode testing

Keithley 2000 Specifications

General

Digits	6.5
DC Voltage Range	100 mV to 1000 V
AC Voltage Range	100 mV to 750 V
Resistance Range	100 Ω to 100 MΩ
Connectivity	IEEE-488 (GPIB)
Display Type	VFD