GW Instek GSP-930 User Manual - Manual (Page 59)

BASIC OPERATION
57
Input Impedance Calibration
Description When an external impedance converter module
(optional accessory ADP-101) is used to convert
the impedance of a device from 50Ω to 75Ω,
some external loss can be induced. The Input Z
Cal function can be used to compensate for
these losses with an offset value.
Note
The Input Z Cal function is only available when the
input impedance is set to 75Ω.
Operation 1. Press
Amplitude
> More[F7]>Input Z Cal[F5] and set
the impedance offset.
Range:
Resolution: 0dB to +10dB
1dB
Display Icon The AMP icon is displayed at the bottom
of the screen when Input Z Cal

0dB.
Using the Built-in Pre-Amplifier
Description The built-in pre-amplifier boosts weak input
signals, such as EMI testing signals, to levels
that are easy to handle, over the entire
frequency range. The built-in pre-amplifier on
the GSP-930 has a nominal gain of 20dB.
In the Auto setting, the pre-amplifier will be
automatically turned on when the reference
level is less than -30dBm. When the reference
level is greater than -30dBm, the pre-amplifier
is turned off.
The bypass setting turns the pre-amplifier off.