Fluke 5790B - Calibrate the Wideband AC Option

Calibration Adjustment and Verification
Calibration 3
3-27
Calibrate the Wideband AC Option
The following procedure is a part of calibration only if the Wideband Option is
installed in your Product. You calibrate the WIDEBAND input in four major steps:
1. Perform the main input calibration first.
2. Characterize the ac source (a 5730A with Wideband option and
associated attenuators, cable, and connectors).
3. Calibrate the WIDEBAND input gain.
4. Calibrate the WIDEBAND input flatness.
Table 3-6 lists the equipment required to calibrate the WIDEBAND input. Before
you proceed, make a copy of Table 3-8 which is the worksheet for WIDEBAND
input calibration.
Table 3-6. Equipment Required for Wideband Calibration
Required Equipment Manufacturer and Model Minimum use Requirements
Multifunction Calibrator
Fluke Calibration 5730A with Wideband
(/5) Option (incl. Cable and 50Ω term.)
3.2 Vrms, 10 Hz - 50 MHz
32 mV - 3.2 Vrms, 1 kHz
Thermal Voltage Converter Precision Measurement EL1100
≈3 Vrms, 10 Hz - 50 MHz
Calibrated for voltage flatness by Fluke
Calibration.
Precision resistive 50 Ohm
load Type N (M/F).
N/A. User made.
50 Ω ±0.01 Ω dc resistance.
AC Voltmeter Fluke 5790B Published specifications.
Nanovoltmeter Keithley 2182A or equivalent 20 nV short-term stability
20 dB type “N” RF Attenuator
(3 each)
JFW Industries 50HFI-020N
[1]
0.0001dB/dB/°C Temperature
Coefficient
[2]
50Ω ± 0.5Ω dc Resistance
10 dB type “N” RF Attenuator
(1 each)
JFW Industries 50HFI-010N
[1]
0.0001dB/dB/°C Temperature
Coefficient,
[2]
50Ω ± 0.5Ω dc Resistance
Cable Assy., 18” Type “N”
(M) to Type “N” (F)
Pomona 4496-T-18 or equivalent
Facilitate connection to DMM for 1 kHz
Wideband Gain verification
Adapter, Type “N” (F) to
Double Banana Plug
Pomona 1740 or equivalent
Facilitate connection to DMM for 1 kHz
Wideband Gain verification
Frequency counter Tektronix FCA3000 5ppm Frequency Uncertainty or Better
[1] The JFW attenuators must be calibrated by Fluke Calibration (see text).