Function Description
R&S
®
TS-PSAM
22
User Manual 1142.9878.12 ─ 12
5.1.5
Discharge unit DCH
(DCH = Discharge Unit)
The discharge unit is provided to allow the controlled discharge of capacitors on the
UUT, to prevent the circuit relays in the test system from being irreparably damaged or
the UUT from becoming charged as a result of the test procedure. For this purpose, a
constant discharge current is generated with an active current limiter. The circuit is pro-
tected against overload by an integrated heat cutout. The residual voltage after dis-
charge is typically less than 100 mV. The DCH can be connected to the local analog
bus via relays.
In order to minimize loading on the circuit relays, the circuit path should be set first,
before the DCH is activated.
Table 5-3: Specifications
Discharge current ranges: (typical)
400 mA, 275 mA, 150 mA und 10 mA
Discharge mode
Constant current
Maximum voltage:
±125 VDC
Discharge residual voltage
<100 mVDC
Discharge power: (average)
2 W max.
Überspannungsschutz
200 VDC max.
Overvoltage protection
Thermal sensor
The
rspsam_dch_ConfigureEnabled
and
rspsam_dch_ConfigureCurrent
functions control the discharge.
5.1.6
Trigger logic
On this topic, see also
.
The R&S TS-PSAM module can be synchronized with other system components by
trigger signals from the PXI trigger bus, or by local trigger events or “software trig-
gers“ . In all such events, the R&S TS-PSAM module can function as a “trigger mas-
ter“ or “ a trigger slave“.
Trigger inputs
The internal FPGA Hardware uses the global trigger input signals from the PXI trigger
bus (PXI_TRIG0 ... PXI_TRIG7) and the local TTL trigger inputs on the front connector
(XTI1, XTI2). In addition, the trigger signals (XTA1, XTA2) derived from the analog
input signal and the four internal feedback trigger circuits of the trigger logic blocks
(IT01 ... IT04) are all used to detect a trigger event. The signals to be considered and
their levels (high/low) are selected in configuration registers.
Trigger logic blocks
There are 4 blocks implemented for the module. Blocks 1 and 2 are available to the
user. You can use them to generate the trigger impulses (single pulses, pulse trains
Function description of the R&S TS-PSAM Module
