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Measurements and Sourcing Voltage
3-3
Performance considerations
Warm-up period
The Model 6487 can be used within one minute after it is turned on. However, the instru-
ment should be turned on and allowed to warm up for at least one hour before use to
achieve rated accuracy. If the instrument has been exposed to extreme temperatures, allow
extra time for the internal temperature to stabilize.
Voltage offset correction
Voltage offset correction should be performed periodically to null input amplifier offsets.
Install the triax shielding cap on the INPUT jack, then use the CAL:VOFFSET selection
in the main MENU. To perform correction via remote, send CAL:UNPR:VOFF.
Autozero
To help maintain stability and accuracy over time and changes in temperature, the Model
6487 periodically measures internal voltages corresponding to offsets (zero) and amplifier
gains; a process known as autozeroing. With autozero disabled, measurement speed
increases up to three times, but measurement accuracy will be reduced. It is recommended
that autozero only be disabled for short periods of time.
To toggle autozero on or off, press the AZERO button. When autozero is enabled, a colon
will be displayed after the reading. Via remote, send SYST:AZER ON (for on) or
SYST:AZER OFF.
Zero check and zero correct
Zero check
When zero check is enabled (on), the input amplifier is reconfigured to shunt the input sig-
nal to low. From the front panel, enable/disable zero check by pressing the ZCHK key
(ZEROCHK message displayed). Refer to
for bus commands. Leave zero check
enabled when connecting or disconnecting input signals.
Zero correct
NOTE
The Model 6487 saves a single zero correct value (not one for each range).
For best results, acquire a new zero correct value after changing to the desired
range.
Содержание 6487
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Страница 35: ...1 20 Getting Started Model 6487 User s Manual...
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Страница 61: ...3 14 Measurements and Sourcing Voltage Model 6487 User s Manual...
Страница 85: ...7 8 Remote Operation and Commands Model 6487 User s Manual...
Страница 86: ...A Specifications...
Страница 88: ...B GeneralMeasurement Considerations...
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