Instrument functions
R&S
®
NGP800
52
User Manual 5601.5610.02 ─ 09
lated voltage output from the R&S
NGP800. The voltage sensing relay remains
switched on even when output is turned off.
● AUTO : The detection and enabling of the voltage sense relay automatically
kicks in when the connection of remote sensing wires (S+, S- ) to the input of
the load is applied. The voltage sensing relay is switched off when output is
turned off in this case.
3. Select "Set" to configure the remote sensing mode.
Once the remote sense is activated, it becomes part of the output feedback path for
R&S
NGP800. Disconnection or shorting of the remote sense lines causes a mismatch
in the actual output voltage versus the reported value of the instrument. The error of
differences is detected by the instrument and the output is turned off automatically with
a corresponding error displayed to instruct the user to check on the connection.
Excessive voltage drop on the loading cables, e.g. using too small wires, can also trig-
ger remote sense protection.
For optimum connection, maintain a maximum voltage drop of 1V on loading cables is
recommended.
6.2.1.3
High impedance mode
If "High Impedance Mode" is enabled, the output is turned OFF with the active current
sinking circuit disabled. The output capacitors discharge is determined by the instru-
ment internal resistors (
～
900
Ω
for 32 V models and
～
3400
Ω
for 64 V models) and
the connected load.
The "High Impedance Mode" does not affect the instrument functions when the output
is turned ON. Voltage down-programming is still assisted by the active current sinking
circuit. If the output is disabled by protection trigger like OVP, OCP, the active current
sinking circuit automatically discharges the output capacitors for safety reasons.
► Select "High Impedance Mode" menu item to activate the high impedance mode.
The R&S
NGP800 activates the high impedance mode.
6.2.1.4
Slew rate control
The "Reduce Slew Rate" is a mechanism used to control the rate at which the output of
voltage changes. If activated, the voltage slew rate up-programming and down-pro-
gramming are reduced when changing voltage on the fly. The reducing of slew rate
control helps to minimize overshoot over wide output and load configuration.
Activating the Channels output
