Lake Shore Model 218 Temperature Monitor User’s Manual
7-14
Service
7.13.15 CALIBRATION SPECIFIC INTERFACE COMMANDS
ADCAL
Calibrates A/D Linearity
Input:
ADCAL <input group>
Returned:
Nothing
Remarks:
Calibrates the A/D linearity of the selected input group. Before issuing command the input
group must be configured as follows: A precision 2.5 V attached to input 1, a precision –2.5
V attached to input 2, and a precision ground at input 3.
<input group> Specifies which group of inputs to calibrate. Valid entries are
A
(inputs 1
–
4),
and
B
(inputs 5
–
8).
ZCAL
Provides the Zero Calibration Constant for each Input
Input:
ZCAL <input>, <type>, <value>
Returned:
Nothing
Remarks:
Provides the zero calibration constant for the selected input. The calibration constant is
calculated using the raw A/D data.
<input> Specifies which input to provide zero calibration constant for.
Valid entries are 1
–
8.
<type>
Specifies the input groups sensor type. Valid entries are:
0 = 2.5 V Diode
2 = 250
Ω
Platinum 4 = 5k
Ω
Platinum
1 = 7.5 V Diode
3 = 500
Ω
Platinum 5 = Cernox
<value> Zero
Calibration
Constant
ZCAL?
Returns Value of Zero Calibration Constant for the Selected Input
Input:
ZCAL? <input>, <value>
Returned:
Returns value of zero calibration constant for the selected input and input configuration.
Remarks:
<input> Specifies which input to query zero calibration constant for.
Valid entries are 1
–
8.
<type>
Specifies the input groups sensor type. Valid entries are:
0
= 2.5V Diode
2
= 250
Ω
Platinum
4
= 5k
Ω
Platinum
1
= 7.5V Diode
3
= 500
Ω
Platinum
5
= Cernox
GCAL
Provides the Gain Calibration Constant for each Input
Input:
GCAL <input>, <type>, <value>
Returned:
Nothing
Remarks:
Provides the gain calibration constant for the selected input. The calibration constant is
calculated using the raw A/D data and is multiplied by the necessary constant to supply the
corrected value for the input type.
<input> Specifies which input to provide zero calibration constant for.
Valid entries are 1
–
8.
<type>
Specifies the input groups sensor type. Valid entries are:
0
= 2.5V Diode
2
= 250
Ω
Platinum
4
= 5k
Ω
Platinum
1
= 7.5V Diode
3
= 500
Ω
Platinum
5
= Cernox
<value> Gain Calibration Constant