- 531's Features:
- Built-in preselector for precise off-air measurements
- Synthesized tuning
- Seven station presets may be recalled by remote control
- Bright, accurate bargraph metering showing: Total Modulation, Stereo Program Audio, Subcarrier Injection, Incidental AM Noise, Signal Strength and Multipath
- Alarms: Overmodulation (peak flasher), Carrier Loss, Excessive Multipath, Audio Loss (loss of either program channel; alarm follows a delay that can be programmed from the front panel between 10 seconds and 2 minutes.)
- Rear-panel terminals present open-collector NPN switch closures to ground concurrent with these front-panel faults.
- 531's Specifications:
- TUNING RANGE: 87.9MHz to 108.1MHz (100kHz steps)
- SENSITIVITY: 10μV (10dBf) for 50dB mono quieting; 250μV (60dBf) is usually required for valid off-air modulation measurements.
- INPUTS: F-Connector antenna input (75 Ohm), BNC high-level RF input, Baseband: A BNC composite/MPX input to the stereo decoder and sub-carrier accepts levels of 1Vp-p or greater •OUTPUTS: Baseband: A BNC composite/MPX demod output delivers 3Vp-p at 100% modulation, Stereo Program Outputs: the balanced XLR stereo program outputs deliver +4dBm, Front-panel headphone jack (1/4 in.) for monitoring the stereo program, AM Noise Output: BNC (synchronous/asynchronous). AM noise output is also routed to the headphone jack in the noise measurement mode
- CARRIER MODULATION DISPLAY:This bargraph display has quasi-peak response with a ‘floating dot’ peak-hold function. It normally shows total peak carrier modulation, but independent positive or negative deviation readings may also be selected. With 100% corresponding to ±75kHz carrier deviation, the display has 1% resolution between 120% and 80%, and 2% resolution between 80% and 46%. Measurement integration may be jumpered for 0.1ms, 0.2ms, 0.5ms or 1.0ms.
- PEAK FLASHER: The flasher is digitally programmable from the front panel in 1% increments between 95% and 125%.
- PILOT/SUBCARRIER MEASUREMENTS: Measurement filters are included for 19kHz, 38kHz, 57kHz, 67kHz and 91kHz. Injection levels between 2.6% and 14% are displayed with 0.2% resolution.
- DEMOD METERING DISPLAY: A dual bargraph shows L / R or L+R / L–R program audio. The display is peak-responding between +10dB and –30dB, and average-responding between –30dB and –64dB. This display also switches to show relative AM noise.
- PROGRAM DE-EMPHASIS: An internal jumper selects the 75μs or 50μs characteristic. Deemphasis may be defeated with a front-panel button.
- OFF-AIR PERFORMANCE: Frequency Response: ±0.5dB, 20Hz-15kHz, Noise :better than 65dB below 100% modulation (with de-emphasis), Distortion: <0.25%THD at 100% modulation, Stereo Separation: typically 50dB (>60dB with baseband input), Crosstalk Measurement: M/S and S/M crosstalk via the stereo sum/difference method
- POWER REQUIREMENTS: 105-130VAC and 210-260VAC; 50/60Hz; 20W.
- SIZE AND SHIPPING WEIGHT: 23” x 16” x 5” (2U); 14 lbs/584mm x 406mm x 127mm ; 6.4 kg
