Giga-tronics 8650B Series, Руководство по эксплуатации

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Series 8650B Universal Power Meters
2-10 Publication 31470-001, Rev C, November 2, 2017
T Gate
The Time Gate mode supplies a digital control voltage to enable or disable readings from any one or all sensors.
Thus, the mode limits a power measurement to a defined interval that is controlled by a start time and duration.
The start time begins after a programmable delay following an external or internal trigger.
Figure 2-5 illustrates the time gated measurement with an external time gated pulse applied to the trigger input.
In this mode, the time gate starts and ends with the input of a high or low TTL level input. The duration of the
measurement corresponds to the duration of the gated pulse.
NOTE:
The Time Gate feature operates only with modulation sensors.
Figure 2-5: External Gating Illustration
1. From the Power Meter Configuration menu, move the cursor to the T Gate option and press [Config] to
display the Gate/Trigger menu.
2. From the Gate/Trigger menu, select the sensor with the cursor keys and then select the mode of gated
operation for that sensor. The options are External Gate , External Trigger Rising , External Trigger Falling
and
Burst Edge
.
a. Gate
This configures the gate to measure only during a high or low input. Gate Low enables power meter
readings on a low logic input, and Gate High enables readings on a high (+5 V) logic voltage input
(See Figure 2-5).
1.) Select the sensor to be configured with the cursor keys. The current configuration of the
selected sensor will be indicated in the window at the bottom of the screen.
2.) Press [External Gate] to set the sensor gate measurement to high or low.
3.) Press [Gate High] or [Gate Low] to set the external gating to a high or low logic state.
4.) Press [OK] to return to the Gate/Trigger menu, or [Cancel] to abort the configuration.