Service Information
5-7
Table 5-2
Model 1801 IEEE-488 bus calibration commands
Command
Description
:CALibration
:UNPRotected
:PREamp
:G1K <value>
:G1K?
:G10K <value>
:G10K?
:G100K <value>
:G100K?
:Z1K
:Z10K
:Z100K
:FS1K <value>
:FS10K <value>
:FS100K <value>
:DATE Ò<string>Ó
:DATE?
:NDUE Ò<string>Ó
:NDUE?
:CALCulate
:SAVE
:ABORt
Calibration root command.
Commands not protected by CAL switch.
Preamp commands.
Directly enter 2mV gain (min = 0.5; max = 1.5; default = 1.0).
Request 2mV gain constant.
Directly enter 200µV gain (min = 0.5; max = 1.5; default = 1.0).
Request 200µV gain constant.
Directly enter 20µV gain (min = 0.5; max = 1.5; default = 1.0).
Request 20µV gain constant.
Measure 2mV range zero.
Measure 200µV range zero.
Measure 20µV range zero.
Measure 2mV range full-scale <value>= 1E-3 to 2E-3.
Measure 200µV range full- scale. <value> = 100E-6 to 200E-6.
Measure 20µV range full- scale. <value > = 10E-6 to 20E-6.
Send calibration date.
Request calibration date.
Send calibration due date.
Request calibration due date.
Calculate calibration constants, test if they are valid (valid
range = 0.98 to 1.2).
Save calibration constants in NVRAM.
Abort calibration procedure.
Notes:
1. Upper-case letters indicate command short form. For example, instead of sending “:CALIBRATION:UNPROTECTED:
PREAMP:CALCULATE,” you can send “:CAL:UNPR:PRE:CALC.”
2. Angle brackets (<>) indicate command parameters and should not be included in the command.
3. Preamplifier calibration constants are stored in NVRAM located on the power supply card.
Table 5-3
IEEE-488 bus calibration summary
Order*
Calibrator
voltage
Divider
ratio
Calibration command
1
2
3
4
5
6
7
0.0000V
0.0000V
0.0000V
0.200000V
0.200000V
0.200000V
-
-
-
-
10
2
10
3
10
4
10
4
10
3
10
2
-
-
-
-
:CAL:UNPR:PRE:Z1K
:CAL:UNPR:PRE:Z10K
:CAL:UNPR:PRE:Z100K
:CAL:UNPR:PRE:FS100K 20E-6
:CAL:UNPR:PRE:FS10K 200E-6
:CAL:UNPR:PRE:FS1K 2E-3
:CAL:UNPR:PRE:CALC
:CAL:UNPR:PRE:DATE ‘<cal_date>’
:CAL:UNPR:PRE:NDUE ‘<due_date>’
:CAL:UNPR:PRE:SAVE
* Commands must be sent in order shown.