Function Description
R&S
®
TS-PSAM
21
User Manual 1142.9878.12 ─ 12
rspsam_dcs_ConfigureCurrentLimit
rspsam_dcs_ConfigurePulsedMode
rspsam_dcs_QueryOutputState
Also the DCPWR GTSL library supports the DCS component of the TS-PSAM module.
5.1.4
Resistance measurement
On this topic, see also
and
With the DC Stimulus (DCS) and current measurement unit (MU), resistances can be
measured in the following ways:
●
A known DC voltage Vs is applied to the resistor that is to be measured and the
resulting current is measured with the MU (Mode V).
●
A known DC current Is is applied to the resistor via the DCS and the resulting drop
in voltage at the resistor is measured with the MU (Mode C).
The resistance measurement is activated via the "rspsam_ConfigureMeasurement"
function. Depending on the "measurementFunction" parameter, a 2-wire
(RSPSAM_VAL_2_WIRE_RES) or 4-wire (RSPSAM_VAL_4_WIRE_RES) measure-
ment is configured. The range parameter configures i.a. the connection between the
components MU and DCS. In the 1 Ohm and 10 Ohm range "Mode C" is set (See
). In every other range "Mode V" is activated (See
). The resistance measurement of TS-PSAN is optimized for in-circuit tests.
Because the voltage is imprinted in Mode V, resistors parallel to a capacitor can be
measured quickly, due to relatively high charging power. Mode V however has the dis-
advantage that the LO-wire cannot be replaced by GND (See figure 1-3). Also in Mode
V, too low resistance values lead to invalid measurements. This is due to limited cur-
rent because of an automatic voltage lowering by the source, if the set max current of
the DCS is exceeded. The correlations are shown in the following table:
Range
Mode
Voltage
Ampere
0.1 Ω to 1 Ω
C
0.5 V max.
100 mA
1 Ω to 10 Ω
C
0.2 V max.
10 mA
10 Ω to 100 Ω
V
0.2 V
25 mA max.
100 Ω to 1 kΩ
V
0.2 V
2.5 mA max.
1 kΩ to 10 kΩ
V
0.2 V
1 mA max.
10 kΩ to 100 kΩ
V
0.2 V
0.1 mA max.
100 kΩ to 1 MΩ
V
1 V
0.1 mA max.
1 MΩ to 10 MΩ
V
5 V
0.1 mA max.
It is possible to measure resistors greater than 10 Ohm with GND by using an individ-
ual programming and wiring of the MU and DCS components. Especially for configura-
tions with high resistance, parallel capacitors and current input, charging times must be
considered.
Function description of the R&S TS-PSAM Module
