Chapter 2 — Functional Description 2-10 Power Supply Operation
ML248xx, ML249xA MM PN: 13000-00164 Rev. K 2-5
GPIB
A standard General Purpose Interface Bus connector is used to connect through GPIB to other test equipment
and a host computer. The power meter series is compatible with IEEE-488.1/2 requirements. Refer to the
power meter Remote Programming Manual for information on using GPIB.
BNC I/O Ports
Output 1
Multi-purpose BNC connector is user-configurable for Analog Output 1 (volts/units), or Limits
(pass/fail (TTL)). It supports pass/fail testing for channel 1. It Can be configured to output a real-time
measurement signal from sensor Input A, which is suitable for levelling purposes.
Output 2
Multi-purpose BNC connector is user configurable for Analog Output 2 (volts/units), or Limits
(pass/fail (TTL)). It supports pass/fail testing for Channel 2. It can be configured to output a real-time
measurement signal from sensor Input B, suitable for levelling purposes.
Input 1 (Digital)
The External Trigger is a multi purpose BNC connector used as a TTL trigger input.
Input 2 (Analog)
Multi purpose BNC V/GHz Input connector used for volts per GHz connection. It supports 0 V to +20 V
nominal input voltage with software selectable scaling. V/GHz is used for automatic CAL FACTOR
correction by applying an external voltage, scaled to frequency. The correct calibration factor for this
frequency is automatically interpolated and applied when in V/GHz calibration factor mode. Different
scaling may be applied to sensor A or B allowing for measurement of frequency translation devices.
Available simultaneously with channel A and/or B data, the data rate is as set on the channel.
VGA Out
For video output to 1/4 VGA external display.
Ethernet – 10/100 Base T LAN Interface
2-10 Power Supply Operation
The power meter power supply is a switch mode type with three DC outputs at +5.8V, –5V, and +12V. The line
power required for correct operation is 85 VAC to 264 VAC at 47 Hz to 440 Hz. When line power is applied, all
three DC outputs will always be present. The main processor is always in operation when the line power is
applied. Within the unit on the Control PCB and the Measurement PCB DC regulators control all internal DC
supplies. Most of these supplies can be switched off in stand by mode by the main processor.
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