ILX Lightwave LDT-5900 Series User Manual page 140

5
C H A P T E R
124
LDT-5980/ 5948
C A L I B R A T I O N A N D T R O U B L E S H O O T I N G
Ca libra t ion Procedure
6d Record UUT-measured resistance (R
6e Replace 1 k resistor with 100 k resistor (R
across resistor as measured by DMM.
6f Record UUT-measured resistance (R
6g Calculate, using Ohm's Law, the voltage drop corresponding to the UUT-measured
resistances.
for x = a & b
V
6h Calculate the 10 A Sensor Voltage Measurement slope and offset using the
equations below:
m
vsens
b
vsens
6i Enable Cal Mode by entering the remote command MODE CAL.
6j Enter the new calibration values by using the command
CAL:SENsor:VOLTage:10UA m
6k Save the new values to flash memory by using the CAL:SAVE command.
6l Return to Sensor Mode by using the MODE SENSOR command.
6m Verify the correct storage of the calibration values by entering
CAL:SENsor:VOLTage:10UA?.
6n Begin calibration of 100 A thermistor current by selecting 100 A thermistor current
from Sensor Parameter Menu. Connect 100
Connect the DMM across the resistor as well to measure voltage.
6o Record voltage (V
sens2a
6p Record UUT-measured resistant (R
6q Replace 100 resistor with 10 k resistor (R
across resistor as measured by DMM.
6r Record UUT-measured resistance (R
) using the MEASure:SENsor? command.
1a
sens1b
) using the MEASure:SENsor? command.
1b
V
sens 1 x
R
1 x 1 x
R
sens 1 x
V V
sens 1 b sens 1 a
1
V V
1 b 1 a
V m V
1 sens 1 b vsens 1 1 b
, b
vsens1 vsens1
) across R as measured by DMM.
sens2a
) using the MEASure:SENsor? command.
2a
sens2b
) using the MEASure:SENsor? command.
2b
) and record voltage (V
.
resistor (R ) to sensor leads.
sens2a
) and record voltage (V
)
sens1b
)
sens2b