Agilent Technologies 4294A Service Manual download pdf (Page 224)

224 13

Application Sample Programs

Measurement controlling oscillator level

Example 13-5 shows a sample program of a measurement by correctly applying specified

test signal level at DUT using the oscillator level monitor function. This program is stored

on the sample program disk as the alc.bas file.

Connect the Agilent 16047E test fixture for lead parts to the Agilent 4294A, and then start

this program. When “Set

Open-Connection” appears, make the connection to measure data

for open compensation, and press the

[y] key and the [Enter] key. Then, when

“Set

Short-Connection” appears, perform the same operation to measure data for short

compensation.

NOTE For how to use the 16047E, for example, the connection to measure data for open/short

compensation, refer to its manual.

Then, when “Set DUT, then Push [Enter] key” appears, mount an DUT onto the test

fixture, and then press the

[Enter] key. A measurement is operated at each measurement

point using the manual sweep function, and the measurement result is displayed (refer to

Figure 13-6). At the each measurement, the oscillator level is controlled to apply the

correct signal level at DUT. After the completion of measurements at all points, “Once

more? [Y]es/[N]o” appears. If you want to measure the capacitor again or another DUT,

press the

[y] key and the [Enter] key to continue the measurement. If you want to finish the

measurement, press a key other than the

[y] key and the [Enter] key.

Lines 80 to 140 Identifies the external controller and Instrument BASIC and sets the

GPIB address and the select code.

Lines 160 to 250 Substitutes the measurement conditions (adapter setting: NONE,

measurement parameter: |Z|-θ, sweep type: LOG, sweep start value: 1

kHz, sweep stop value: 10 MHz, Number of measurement points: 21,

trace A display format: logarithmic Y axis, trace B display format:

linear Y axis, oscillator level mode: CURR, test signal level: 1 mA)

into the variables: Adapter$, Meas_para$, Swp_type$, Start, Stop,

Nop, Fmt_a$, Fmt_b$, Power_mode$ and Level, respectively.

Lines 260 to 270 Substitutes the limit of difference between test signal level and its

monitor level (1%), and the maximum number of times to iterate a

setting the oscillator level into the variables: Err_limit and Iteration

(10 times), respectively.

Lines 290 to 300 Sets the adapter selection to Adapter$ and then triggers a reset.

Lines 310 to 350 Sets the measurement parameter to Meas_para$; the sweep type,

Swp_type$; the sweep start point, Start; the sweep stop point, Stop,

respectively.

Lines 390 to 400 Enables bit 8 (calibration/compensation data measurement

completion) in the instrument event status register to use an SRQ and

sets bit 2 in the service request enable register to 1.

Lines 410 to 440 Uses the FNFixt_comp subprogram to measure open/short data. If an

error is detected after each measurement, stops the program. For the

FNFixt_comp subprogram, refer to the description in

Example 4-3 on

page 65.

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