Characteristic Specifications Supplemental Information
44 APx555 B Series Audio Analyzer: Analog I/O Specifications
555
DC Voltage Measurement
Maximum Rated Input ±160 Vdc, 230 Vpk (dc + peak ac)
Input Ranges 310 mV, 620 mV, 1.25 V, 2.5 V, 5 V,
10 V, 20 V, 40 V, 80 V, 160 V, and
320 V
Auto-ranging thresholds are 66–70%
and 150–158% of range value (Vpk)
Accuracy
310 mV & 620 mV input range ±(0.7% reading + 800 µV)
All other input ranges ±(0.7% reading + 0.1% range)
Normal Mode Rejection Typically > 90 dB, 20 Hz to 20 kHz.
NOTES to SPECIFICATIONS:
1 Generator performance is not guaranteed for amplitude settings below 100 Vrms [283 Vpp].
2 System specification including contributions from both generator and analyzer.
3 Generator load must be linear and 600 balanced or 300 unbalanced; total shunt C must not exceed
800 pF.
4 The “+” symbol in “THD+N” indicates rms summation of the two components. “THD” is the rms summation of H2
to H9 or 1 MHz if lower.
5 Drift of the internal frequency reference is typically <1 ppm / year, however it is lockable to an external reference.
6 Signal must be 200 mV for specified residual IMD; analyzer must be set to “d2+d3” for MOD and DFD, or
“U1…U9” for DIM.
7 The ratio (F
mean
/ F
diff
) can be as low as 2.6 when measuring d2+d3 or d2 only. Avoid ratios near 3.5, 4.5, or 5.5.
8 Valid only for the balanced input configuration within the common range shown.
9 Valid only with DC coupling, both channels. High pass filters may significantly degrade performance at low fre-
quencies.
10 Low pass cutoff must be higher than high pass cutoff. DSP warping may significantly increase roll-off rate and
lower ENBW.
11 For THD+N and THD specifications, HPSA must be activated. Performance degraded if not using HPSA.
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