Current Adjustment
Current output uses an internal resistance value to calibrate all channels.
This resistance value is approximately 244
Ω
.. The current is output
adjusted by measuring the voltage developed across this resistor.
Note
You may also, optionally, use an external resistance value (or load) on each
channel for current output and calibration. If you wish to specify an external
resistor value, you must send the
DIAG:CAL:OUTP CHAN
command and
perform the adjustment at each channel output. Any load value may be used
but values in the range of 50
Ω
to 500
Ω
are recommended.
Note that during the adjustment process self-heating of the external load
may affect the adjustment.
To set the internal resistance value use the following CALibration
commands:
CALibration:CONFigure:RESistance?
CALibration:VALue:RESistance <value>
The resistance value set, either internal or external, is not stored.
When using the internal resistor value, the general procedure is:
1.
Make the connections shown in Figure 5-5.
2.
Send the
CALibration:CONFigure:RESistance?
query to the
module and read the response until a 1 is returned (typically the first
query response).
3.
Read the resistance on the DMM.
4.
Send the DMM value read to the module using the
CALibration:VALue:RESistance <
value>
command.
The resistor value is only set once for current calibration of all channels.
Optional
If you are using an external resistor value, for each channel:
1.
Send the
CALibration:CONFigure:RESistance?
query to the
module and read the response until a 1 is returned (typically the first
query response).
2.
Measure the channel’s external resistor value on the DMM.
3.
Send the DMM value read to the module using the
CALibration:VALue:RESistance <
value>
command.
Chapter 5
Adjustments 65
Summary of Contents for E1418A
Page 4: ...Notes 4 HP E1418A 8 16 Channel D A Converter Service Manual Contents ...
Page 8: ...Notes 8 HP E1418A D A Converter Module Service Manual ...
Page 58: ...Notes 58 Verification Tests Chapter 4 ...
Page 66: ...Figure 5 5 Internal Resistor Adjustment Connections 66 Adjustments Chapter 5 ...
Page 81: ...Figure 6 1 8 Channel Disassembly Chapter 6 Service 81 ...
Page 82: ...Figure 6 2 16 Channel Disassembly 82 Service Chapter 6 ...
Page 84: ...Notes 84 Service Chapter 6 ...
Page 90: ...Figure 7 1 HP E1418A Replaceable Parts 90 Replaceable Parts Chapter 7 ...
Page 91: ...Figure 7 2 Common Terminal Module Replaceable Parts Chapter 7 Replaceable Parts 91 ...