Keysight Technologies B2980A Series Demo Manual page 3

03 | Keysight | Using an External Trigger to Measure Current with B2980A Series – Demo Guide
Concept
Figure 1 illustrates the connection diagram and basic setup conditions for the demo,
which uses a B2985A/87A ammeter to make current measurements whenever it receives
an external trigger signal. The B2980A series will measure current using the settings
shown below while sourcing voltage across the resistor.
B2985A/87A
Voltage Source
High
J2
Low
DUT : 100 GΩ Resistor
Sourced Voltage : 1 V
Measure Delay : 300 μs
Trigger Count : Any or INF.
Figure 1. Connection diagram and basic condition
Figure 2 shows the parameters used to define the measurement timing from the instru-
ment's front panel. The specified source value is outputted immediately after pressing
Voltage Source . Next, you will need to configure the B2985A/87A ammeter to
accept an external trigger and make a current measurement.
V
Source Value
Output
T
Off State
Output ON
Figure 2. Timing chart for the current measurement
Figure 3 shows the external trigger signal requirements to initiate a current measurement
from the ammeter. Positive or negative logic can be used to set the external trigger pulse.
V
t
W
5 V
Time
Positive Logic
t : Trigger Pulse Width > 10 µs
W
Figure 3. External trigger signal requirements
N1422A (DUT) B2985A/87A
Ammeter
Input
J1
Common
Trigger In
External Trigger Signal
T : Measure Delay
MD
T : Aperture Time
AP
T T
MP MP
T T T
AP MD AP
MD
External Trigger
V
t
W
5 V
Time
Negative Logic
A
-
T
: Measure Trigger Period
MP
: Measurement
T
MP
T T
AP
MD
Time