NF ZA57630, Инструкция по эксплуатации

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4.3 Setting Measurement Signals
4
-
16
ZA57630
○
Normal DC bias and HV DC bias
HV DC bias can be used when the measurement mode is IMPD−3T and IMPD−2T. When
[OSC]
− [DC BIAS] − [HV BIAS]
is set to ON, HV bias is enabled. When it is set to OFF,
normal DC bias is enabled.
The setting range of normal DC bias is a maximum of ±5 V, but a maximum of ±40 V can be
set for HV DC bias. A large DC bias can be applied to the DUT for measurement, but HV DC
bias has the following limitations.
・
The output impedance of the measurement signal connector (
H
CUR
) is approximately
1 kΩ for DC and 50 Ω for AC. Consequently, the bias voltage actually applied to the
DUT is significantly attenuated in the case of a DUT in which DC current flows
(resistor, inductor, etc.). In the case of normal DC bias, the output impedance is
approximately 50 Ω regardless of the frequency range.
・
The lower frequency limit for which measurement is possible is 1 kHz. In the case of
normal DC bias, the lower measurement frequency limit is 10 µHz.
○
Limits on the measurement signal amplitude setting range and DC bias setting range
When normal DC bias is used, the settings for the measurement signal amplitude (converted
to the peak value) and DC bias are limited to a total of ±5 Vpk. Please note that when the
measurement signal amplitude is set to 3 Vrms, the DC bias setting range is limited to a
maximum of ±0.74 V(=(5−3 ×1.42 ( ≈ 2 ) ).
When HV bias is used, the settings for the measurement signal amplitude (converted to the
peak value) and DC bias are limited to a total of ±42 Vpk. Please note that when the
measurement signal amplitude is set to 3 Vrms, the DC bias setting range is limited to a
maximum of ±37.74 V(=(42−3 × 1.42 ( ≈ 2 ) ).
○
Selecting the DC bias output connector
Normally, the DC bias is added to the measurement signal output and then output from the
OSC connector on the front panel.
When the measurement mode is IMPD−EXT and G−PH, the DC bias will be output from the
DC BIAS OUT connector on the rear panel if
[OSC]
− [DC BIAS] − [OUTPUT CONNECTOR]
is
set to
[REAR]
. Please note that the DC bias will not be output from the OSC connector on the
front panel at that time. Use this setting when you wish to supply the DC bias applied to the
device/equipment under test via a different path than the signal for measurement.
○
Setting the DUT drive amplifier gain
When the measurement mode is IMPD−EXT and G−PH, setting the DUT drive amplifier
gain (
[OSC]
− [POWER AMP GAIN]
) enables directly setting it as the DC bias to apply to the
DUT. If the DUT drive amplifier gain is set to K, (−5 to +5) × K V will become the setting
range. The amplitude limit setting range and mutual setting restriction range of DC bias and
measurement signal amplitude will also increase by K times (in the case of |K|<1, the range
is reduced from ±5 V). If a DUT drive amplifier will not be used, set to the initial value of 1.0.