8.The ENTBY block. This block includes the knob, the step &) @j keys, the number pad, and the backspace @ key. These allow you to enter numerical data and control the markers.

You can use the numeric keypad to select digits, decimal points, and a minus sign for numerical entries. You must also select a units terminator to complete value inputs.

The backspace key (ZJ has two independent functions: it modifies entries, and it turns off the softkey menu so that marker information can be moveed off of the grids and into the softkey menu area. For more details, refer to Chapter 2.

10.INSTBUMENT STATE function block. These keys allow you to control channel-independent system functions such as the following:

n copying, save/recall, and HP-IB controller mode n limit testing

H external source mode n tuned receiver mode n frequency offset mode n test sequence function

n harmonic measurements (Option 002) n time domain transform (Option 010)

HP-IB STATUS indicators are also included in this block.

11.B key. This key returns the instrument to either a known factory preset state, or a user preset state that can be dellned. Refer to the “Preset State and Memory Allocation” chapter for a complete listing of the instrument preset condition.

12.PROBE POWER connector. This connector (fused inside the instrument) supplies power to an active probe for in-circuit measurements of ac circuits

13.B CHANNEL connectors. These connectors allow you to apply an input signal to the analyzer’s R channel, for frequency offset mode.

14.PORT 1 and POET 2. These ports output a signal from the source and receive input signals from a device under test. PORT 1 allows you to measure S12 and S1l. PORT 2 allows vou to measure SX and SW.

l-6 HP 6753E Description and Options