Keithley 2182 Service Manual page 32

Preparing the Model 2182 for calibration
1. Turn on the Model 2182, and allow it to warm up for at least 2-1/2 hours before
performing the calibration procedure.
2. Start the calibration process as follows:
A. Access the calibration menu by pressing SHIFT then CAL.
B. Use the up and down RANGE keys to scroll through the available calibration menu
items until the unit displays RUN, then press ENTER.
C. At the prompt, enter the calibration code. (The default code is 002182.) Use the left
and right arrow keys to move among the digits; use the up RANGE key to increment
numbers, and press the down RANGE key to specify alphabetic letters. Confirm the
code by pressing ENTER.
D. Choose N at the prompt to proceed without changing the code, then press ENTER.
Front panel short and open calibration
1. At the start of calibration, the unit will prompt for a front panel short:
FRONT SHORT
2. Connect the Model 2188 low-thermal shorting plug to the instrument front panel input
jack, as shown in
thermal equilibrium.
Figure 2-1
Low-thermal short connections
REM STEP SCAN CH1 CH2 CH3 CH4 CH5
TALK
LSTN
SRQ
SHIFT
TIMER
HOLD TRIG FAST MED SLOW REL FILT
%
MX+B V -V L SYNC TYPE
1 2
SHIFT / ACAL
DCV1 DCV2 V 1 V 2
DELAY HOLD BUFFER
LOCAL
EX TRIG TRIG STORE RECALL
POWER
CONFIG HALT SETUP
STEP SCAN SAVE RESTR DIGITS RATE
MODEL 2182
NOTE Keep drafts away from low-thermal connections to avoid thermal drift, which could
affect calibration accuracy.
3. Press ENTER to start short-circuit calibration. While the unit is calibrating, it will
display:
CALIBRATING
Figure 2-1. Wait at least three minutes before proceeding to allow for
CHANNEL 1
HI
MATH
CH6 CH7 CH8 CH9 CH10
REAR
4W
AUTO ERR BUFFER STAT
HI
CHANNEL 2
2182 NANOVOLTMETER
120V MAX
OUTPUT A TCOUPL
OUT
TEMP TEMP
FILT REL
1 2
RANGE
LIMITS
AUTO
VALUE ON/OFF
12V MAX
RANGE
GPIB RS232 CAL TEST
CAT I
EXIT ENTER 350V PEAK ANY
TERMINAL TO CHASSIS
Calibration
2188 Low
Thermal Short
LO
!
LO
2-7