1. Introduction

Even though we know that you are eager to get going, we urge you to take a few minutes to read through this part of the introductory chapter carefully before plugging the line con­nector into the wall outlet.

This instrument has been designed and tested for Measurement Category I, Pollution Degree 2, in accordance with EN/IEC 61010-1:2001 and CAN/CSA-C22.2 No. 61010-1-04 (in­cluding approval). It has been supplied in a safe condition. Study this manual thoroughly to acquire ade­quate knowledge of the instrument, especially the section on Safety Precautions hereafter and the section on Installation on page 1-7.

2. Safety Precautions

All equipment that can be connected to line power is a potential danger to life. Handling restrictions imposed on such equipment should be observed.

To ensure the correct and safe operation of the instrument, it is essential that you follow gen­erally accepted safety procedures in addition to the safety precautions specified in this manual.

These units are designed for indoor use only.

The instrument is designed to be used by trained personnel only. Removing the cover for repair, maintenance, and adjustment of the instrument must be done by qualified personnel who are aware of the hazards involved.

The warranty commitments are rendered void if unauthorized access to the interior of the instrument has taken place during the given warranty period.

2.1. Caution and Warning Statements

CAUTION: Shows where incorrect procedures can cause damage to, or destruction of equipment or other property.

WARNING: Shows a potential danger that requires correct procedures or practices to prevent personal injury.

2.2. Symbols

Shows where the protective ground terminal is connected inside the instrument. Never remove or loosen this screw

This symbol is used for identifying the functional ground of an I/O signal. It is always connected to the instrument chassis.

Indicates that the operator should consult the manual.

One such symbol is printed on the instrument, below the A and B inputs. It points out that the damage level for the input voltage decreases from 350 Vp to 12Vrms when you switch the input impedance from 1 MΩ to 50  Ω.

2.3. If in Doubt about Safety

Whenever you suspect that it is unsafe to use the instrument, you must make it inoperative by doing the following:

  • Disconnect the line cord
  • Clearly mark the instrument to prevent its further operation
Fig. 1‑1 Do not overlook the safety instructions!
  • Inform your Pendulum Instruments representative.

For example, the instrument is likely to be un­safe if it is visibly damaged.

2.4. Disposal of Hazardous Materials

CNT-90 & CNT-90XL only

If your instrument was ordered with a built-in battery supply (Option 23/90), it contains 12 Li-Ion cells arranged as a fixed battery pack with internal protection circuitry.

Even though this type of cell does not cause environmental damage in the same way as NiCd, for instance, you should dispose of a worn-out battery pack at an authorized recy­cling station or return it to Spectracom.

Individual cells cannot be replaced.