Operation; Panel Features - HP 4937A Operating And Service Manual

MODEL 4937A
SECTION III
OPERATION
3-1. INTRODUCTION
3-2 This section contains information on front and rear panel features, seif check procedures, and
error codes, It also describes typical operating modes. The principles of operation of the measure¬
ments are explained in Appendix A of this manual,
3"3. OPERATING CHARACTERISTICS
3-4
xhe HP 4937A provides two types of functions: Transmission Impairment Measurements and
Supervisory Signaling.
The transmission Impairment measurements that can be made with the HP 4937A are:
• Level and Frequency
• Noise
• Noise with Tone
• Signal to Noise
• Noise to Ground
• Return Loss
Signaling capabilities of the HP 4937A are:
• Supervisory signaling simulation
• Establishing talk condition for transmission testing
• Ability to hold two 2-wire circuits for testing
The types of supervisory signaling simulation are:
•
Loop
Start
• Ground Start
• Loop Reverse Battery
• E/M signaling Types I, II, and 111
• Wink
3-5. PANEL FEATURES
3-6. Figure 3-1 identifies the front and rear panel features and includes a brief description as to the
function of each feature.