Line Frequency Filter Adjustment; Introduction; Procedure - Ametek 7270 Instruction Manual

2.3 Line Frequency Filter Adjustment

2.3.01 Introduction

2.3.02 Procedure

8) Connect a BNC cable between the OSC OUT and A input connectors on the
front panel of the instrument.
9) The right-hand side of the display should now indicate R, the vector magnitude,
close to 100% of full-scale (i.e. the sinusoidal oscillator output, which was set to
1 kHz and a signal level of 0.2 V rms by the Auto-Default function, is being
measured with a full-scale sensitivity of 200 mV rms) and , the phase angle, of
near zero degrees, if a short cable is used.
This completes the initial checks. Even though the procedure leaves many functions
untested, if the indicated results were obtained then the user can be reasonably sure
that the unit incurred no hidden damage in shipment and is in good working order.
The model 7270 incorporates a line-frequency rejection filter, which is normally
supplied set to 60 Hz. If the power line frequency of the country in which the
instrument is to be used is also 60 Hz then the setting does not need to be changed.
If, however, the unit is to be used in an area with a 50 Hz power line frequency the
setting should be changed using the following procedure.
1) Turn the model 7270 power switch to the I (on) position.
2) The instrument's front panel display will now briefly display the following:-
Chapter 2, INSTALLATION AND INITIAL CHECKS
Figure 2-5, Main Display
2-5