Frequency Readout and Count Accuracy Test

This test applies to the following models:

Frequency Readout Accuracy and the Marker Frequency Counter Accuracy are specified as follows:

Frequency Readout Accuracy = ± [(Readout Frequency x Frequency Reference Accuracy) + (RBW Centering) + (0.5 x Horizontal Resolution)]

Where: Horizontal Resolution = Frequency Span/(Trace Points – 1)

In this test the RBW is 50 kHz, the Span is 1 MHz, and the trace points are set to 1001.

Marker Frequency Counter Accuracy = ± (Marker Frequency x frequency reference accuracy + counter resolution)

Where: Counter Resolution = +/- 1.0 Hz

For this test, the Fieldfox reference is locked to the signal generator reference. The 10 MHz reference connection removes the frequency reference accuracy term from the specification. The specifications can therefore be written as:

Frequency Readout Accuracy = ± [(RBW Centering) + (0.5 x Horizontal Resolution)]

Marker Frequency Counter Accuracy = +/- 1.0 Hz

Since the two measurements use the same test setup, the test is run twice. One measurement is made with the frequency counter off. Then the measurement is repeated with the frequency counter on.

Test type:

performance

Related specification:

Frequency Readout Accuracy

Marker Count Accuracy

Related adjustment:

Frequency Accuracy

Required Test Equipment

Test Equipment

Recommended
(see main equipment list for alternative models)

Signal Generator #1

  • For N991xA, N992xA, N993x

E8257D with options:

  • 550
  • 1E1
  • 1EA or 1EU

  • UNR or UNX or UNY

Signal Generator #1

  • For N995xA, N996xA, N991xB, N993xB

N5183B Options [532 or 540], UNY

Cable, BNC

8120-2582

Cable, 3.5 mm (m) to 3.5 mm (m)

11500E

Adapter, 3.5 mm (f) to Type-N (m)

1250-1744

Adapter, 3.5 mm (f) to 3.5 mm (f)

83059B

Adapter, 3.5 mm (f) to 2.4 mm (f)

11901B

 

Connection Setups

The following notes apply to illustrations in the FieldFox Help:

  • Only a single representative model will be shown.
  • Some illustrations may differ than those in TME.

  • For procedures that apply to multiple ports, illustrations will show the setup on only one test port.

Frequency Readout and Count Accuracy Test Setup